Georgian Stairs Clearance and Opening

I have absolutely no idea how to create an opening for a grand Georgian staircase. Here’s my attempt

Untitled2.skp (728.5 KB)

It looks like something’s missing but I can’t quite see it.

Any corrections and suggestions are greatly appreciated.

Well, you are persistent…I’ll give you that. This approach is much more on the mark than your attempts at a spiral stair in a different thread. However, you have not adhered to the information provided to you in the other thread. Your riser height is far too shallow for an interior stairway. Optimum riser height should be about 0.1778m to 0.1905m as was pointed out before in the thread at this url: Help on Stairs Design

I didn’t measure that out. It was a downloaded component so I assumed it was already good to go. I’ll find a way to adjust the risers.

Edit: Here’s the adjusted model (I deleted the wall for easy editing and viewing). It only says ~0.19 meters for me.
Untitled2.skp (704.5 KB)

Aside from the riser, what else is missing?

The only thing I can see is a protective barrier (ie hand rail) to stop you falling down from the landing.
And maybe some support so that the landings aren’t relying on sky-hooks to hold it up.

One thing to consider is the opening between the balusters. If you are subject to a building code, you may need to add another baluster to each tread. A four inch (102mm) sphere shouldn’t pass through the guard.


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Honestly, I have absolutely no idea what the building codes here are or where to get them. But I’m not making this to be built, just for the design (at least that was the instruction) and she didn’t really give us any codes and everytime I ask her “Is this okay?” she almost always replies “It’s your design. It;s up to you.”

There should be a registar of contractors some where around who would give you the low down on what is to be done to make it work right . . and the rules / laws concering how things are to be built !

The low down would come from engineers/architects following applicable codes.
If you want some light reading on the subject or a cure for insomnia, you could read here:



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While I was still a student (and long before I became a licensed architect) some of my more creative, although implausible, endeavors relied on skyhooks as a means of structural stability!

According to our code that would be too steep to be accessible, except in residential exit stairways and staircases inside private homes. Accessible stairs should have risers of about 0,15…0,16 m and treads of 0,3…0,34 m. A “palace” stair or an outside stair might have risers of about 0,14 m but treads should grow accordingly. The rule of thumb for a comfortable stair says that the sum of 2 risers and one tread should be 0,62…0,64 m.


Here in the U.S. code requirements for residential and commercial stair riser heights vary. In my example, metric units were indicated and those dimensions would translate to about 7" up to 7 1/2" using the standard system of measurement employed in America (sometimes referred to as “Imperial measurement”). These dimensions typically define the upper and lower limits for riser heights in new residential construction.

I would be happy to help with stairs if you need it. Peace, Billy

This may help if you are still looking, your ceiling to wall is 118.17 inches. These (mine) are 118.25 inches, were as your version are 123.27 inches. You say they are ONLY for design purpose still these are a 8 inch rise per tread and made up the difference by adding layered 3/4 plywood risers in between landings. If you use these have at it BUT you will need to re-figure the hand railings and banisters. They appear to be broke into components so that’s half the battle…Peace…

Staircase.skp (750.3 KB)